Numerical analysis for free flow through side rectangular orifice in an open channel

A. Hussain, A. Haroon

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Side orifice is a hydraulic structure provided in the walls of a channel to divert flow from the main channel to another channel. It is used widely in environmental engineering and irrigation engineering. In the present study, numerical simulation has been performed to analyze the flow characteristics of a rectangular side orifice using the CFD program with ANSYS-CFX code. Finite volume method is used to solve the governing equations of the standard k-ε turbulence model in prismatic channels. The CFD model developed has been verified with the available experimental studies of Hussain and his associates. On comparing with experimental observations; it is found that the CFD model simulates the flow through the orifice with good accuracy. Flow pattern for a side orifice has also been analyzed for streamline pattern, velocity distribution, velocity contours. Further, a reverse flow in the main channel has been noticed near the vicinity of the orifice in the main channel.

Original languageEnglish (US)
Pages (from-to)314-321
Number of pages8
JournalISH Journal of Hydraulic Engineering
Issue numberS1
StatePublished - 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 Indian Society for Hydraulics.


  • Rectangular orifice
  • coefficient of discharge
  • k-ε turbulence model


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